for what o know stock rods and cranks are good for atleast 500 horses, just keep the revs below 6 grand, infact if i know of 5.0,s doing 10.00 et,s with stock shortblocks and AOD trannies, but they dont last forever. My Recomendation would be to put a set of HiPo 289, heads or the 5.0 heads of an explorer, they flow decently. then mount two turbos from a firebird turbo, (T03 A/R .63) and keep the boost below 14PSI and revs below 6G and you'll be doing high 11,s and that on an investment of under 1000$